Up until now, the Google home page was meant to be as lite as possible. It only contained one image with the Google logo, some links to other Google tools, services and legal information. But that has changed recently as a new prominent image appeared to publicize the Google Chrome web browser. And this is quite huge as the overall advertisement's size is almost the same as the biggest element on the Google's home page: Google's logo itself!
Let's see how the Chrome's usage number will evolve in the future but I'm quite sure they'll get a huge boost from this campaign. It also remains to be seen whether this is a limited time advertisement or if we should get accustomed to the prominent Chrome advertising... until we finally switch, that is!